| People buy after market auto parts for various | | | | turbulence which can be dangerous. The rear bumper |
| reasons. It may be because of a broken or worn out | | | | diffuser is designed to provide an area so that when |
| part and an after market part is cheaper than buying a | | | | the air between the car's airflow and the external |
| new factory part from the dealer. Sometimes people | | | | airflow come together a boundary is formed and this |
| purchase parts in order to enhance how their car | | | | area is then less turbulent. |
| looks. Many parts are purchased to increase the | | | | This is the key idea to keep in mind when considering |
| power of a car. A rear bumper diffuser may be | | | | purchasing one. Your car may have been designed like |
| purchased for both looks and performance at the | | | | some BMW's, Ferrari, Mercedes or other cars with a |
| same time. | | | | very high top end. On a typical street car the bumper |
| I'm sure you have seen a bumper diffuser on a car, | | | | diffuser does very little until high speed are obtained. |
| but you might not have recognized what you were | | | | As mentioned before, many high end cars such as |
| looking at. A these products can come in various sizes | | | | Ferrari, BMW, Corvette, are now coming with a stock |
| and styles. It depends on the car make and what you | | | | rear diffuser. Some have extensions under the bumper |
| are trying to accomplish. | | | | which can accomplish the same goal. A well designed |
| As a vehicle moves through the air, there is a | | | | system can both look good and offer you better high |
| corresponding air flow over the entire car, both over | | | | speed stability for your car.. |
| the top as well as underneath. One critical area is the | | | | In general, all after market diffusers are either a |
| flow under the car. The air flow under the car probably | | | | replacement bumper with a built in diffuser section or a |
| is faster, which will produce a phenomena called down | | | | part that must be attached to the car which serves |
| force. Down force tends hold the car to the road and | | | | the same function. Generally you must cut one or |
| improve hi-speed stability and cornering. It is a good | | | | more holes in your bumper before the diffuser part will |
| thing, and the faster you go, the more you want. It is | | | | fit and be effective. If your need for high speed stability |
| almost always built in on race cars and now it is | | | | or a more unique look is worth a little installation time, |
| showing up on more and more street cars. | | | | then a this may be your answer to more stability and |
| One method of increasing down force is a rear | | | | unique looks. However before you purchase this |
| bumper diffuser. Here is how one of these works. A | | | | product, completely check out the installation |
| problem can occur when a high-velocity air stream | | | | instructions and the pictures of different looking |
| from under the body meets the much slower airflow | | | | applications using it. You may want a bumper diffuser |
| of the ambient atmosphere coming over the car and | | | | just for performance or perhaps because it also looks |
| behind the car. This collision of airstreams causes | | | | good. If you want both, then this is a product for you. |